How to Efficiently Pass Multiple Parameters to ASP.NET MVC Action Methods?

Detailed explanation of ASP.NET MVC multi-parameter routing

In the process of building an ASP.NET MVC API, you may encounter situations where the API endpoint requires multiple parameters. For example, when using the example URL that contains "artist" and "api_key" parameters, it may not be clear to you how to pass these parameters to your action method in MVC.

Pass parameters to the operation method

In MVC, you can easily pass parameters to action methods simply by adding them as method parameters. For example, given an operation:

<code class="language-csharp">public ActionResult GetImages(string artistName, string apiKey)</code>

MVC will seamlessly populate these parameters when provided with a URL like:

<code>/Artist/GetImages/?artistName=cher&apiKey=XXX</code>

Handle the parameter named "ID"

MVC provides a unique feature for the parameter named "id". Any parameter with this name can be placed directly in the path rather than in the query string. So, a method like this:

<code class="language-csharp">public ActionResult GetImages(string id, string apiKey)</code>

can be populated correctly using a URL like:

<code>/Artist/GetImages/cher?apiKey=XXX</code>

Custom routing rules

For more complex cases, you can customize the routing rules that MVC uses for lookup operations. The global.asax file contains routing rules that can be modified. By default, the rules are defined as:

<code class="language-csharp">routes.MapRoute(
            "Default",                                              // 路由名称
            "{controller}/{action}/{id}",                           // 带参数的URL
            new { controller = "Home", action = "Index", id = "" }  // 参数默认值
        );</code>

If you wish to support URLs like:

<code>/Artist/GetImages/cher/api-key</code>

You can add an additional routing rule, for example:

<code class="language-csharp">routes.MapRoute(
            "ArtistImages",                                              // 路由名称
            "{controller}/{action}/{artistName}/{apikey}",                           // 带参数的URL
            new { controller = "Home", action = "Index", artistName = "", apikey = "" }  // 参数默认值
        );</code>

By doing this, you can use the example method provided earlier.

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